Compensating valve



S. G. NEAL.

coMPENsAnN vALvE. APPLICATION FILED JAN. 3,192l.

Patented Oct. M, 1922.

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DELAWARE, A GURPOBATION F :DELA:

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To aZZww/m, t magica/Germ i r it known that l, SrnNonn Naan. a citizen" of thellnited States and `residing in the borough oit Manhattan, city, county,

and @tate oil New York, have invented cer` `tain new and useit'ul improvements in Compensating- Valves `(Case No. 381), of which the following rsa specification i lhis invention `relates to improvements in le. that typeert coinpensating` valves shown in ."ljatent No. 1,089,579,dated March 10, 1914, i and alsowshovvn `in Patent No; 1,314,975, `dated September 2, 1919. Thesecompensat y ingr' valves areloperated by equalizing reser voir pressure and braltepipe pressure and Acontrol connection 'between the main `reser-` i voir andthe brake pipe and between the brake pipe and atmosphere, and maintain y f launform brake pipe pressure. .i "'l'lhe` object oi" thisinventionis to provide merels to insure a .rapidV reduction inequal- `ming," reservoir'pressure `When the engineers brake. valve is placed in emcrg'encykposition y for fthe purpose of securing' van" emergency 1:25 application of the brakes.` s When `'the engincers brake valve `isplaced in` `emergeney position, there isa very `rapid reduction in `brake pipe pressure and a slower reduction `object of `this invention to provide means `tor quicklyreducing theeq'ualizing reservoir pressure to zero, or approximately so, in order to insure the rapid operationotthe compensator in, emergency applications" of the brakes and `toprevent tlie main reservoir pressure exhausting throughtlie compensator.` Another object of the invention is to providel meansnvhereby theuequalizing reservoir venting Will not operate during all slow service reduction in brake' pipe pressure,` but will only operate on a sudden` re? dnction in brake pipe pressure designed to secure an emergency application et the brakes.` 1

ln the drawing: 1 v

l? 1 isa. diagrammatic View showing the compensator andits connections to the engineers valve and the main `reservoir `and equalizing reservoir; y

Figa 2 a verticalsectionalviewof the compensatingvalve; and

Fig. 3 a similar vievv taken on the line Referring tothe various parts by numerin eqnalizinpl reservoir pressure, and itis the als, 1 designates the compensating valve 2; the engfinees 'bralevalve; 3 the main resers voir; and fr `the equalizing reservoir. The brake pipe 5` is connected to the engineers brake valve by pipe 6, in the usual manner, and connected tothe compensator bypipe y 7, the latter pipe being connected to the compensator at 8. The main reservoir-is con-` nected to the engineers valveby; pipe 9 and to Athe compensator by pipe 10, said pipe being connected tothe bottom of the compensator atll. The equalizing` reservoir is connectedto the enginee1"s valve bypipe 12 and tothe compensator by pipe 13, said pipe `being connected to the compensator at 141. All o'ltlhese-pipes are provided withV the usual eut-eff valvesli The engineers valve may be ,mocliliecl, as `described in Patent No. 1,099,579; and also in Patent No. 1,314,975, to render the equalizing; discharge piston inoperative, sokthat the brake pipe exhaust will be secured" through the compensating valve. l y

The main operating parts of the compen eating Valve are constructed substantially as shown in `Patent No. 1,314,975,21nd comprise ab casinginjivhich is arranged a diaphragm 16 from which depends thevalve-Operating voke17-` The diaphragm 16 divides the `interior et the casing' intoan upper equalizingg' chamber 18 whichl is in communication with` the equalizing reservoir l through pipe 13; and a lower brakepipe chamber 19 which is at all times in communication with the brake pipe 5 `through the branch pipe 7. ,fr release` valve 20 isconnected to the yolre17 and is provided Witha depending Winged portieri Which travels in a valve `cage `formed at the inner end of an exhaust vious that `when diaphragm 16 is depressed by a superior pressure `in the equalizing reservoir vchamber 1S, the exhaust valve 20 will be' closed and the supply valve `23 Will be opened. Because oit the lost-motion con` `nection beth/een the yoke 17 and valves 20 and there is a peint in the movement of the diaphragm `16 at which both of said valves will be closed. This also insures the closing "of one kvalve before the other valve is opened by the Vmovement of the diaphragm.

The release valve 2O is tormed with an upwardly extending neck 24 terminating in a head 25. The yoke 17 is provided with a forked portion 26 which receives the neck 24 and connects the release valve to the yoke. The supply valve 23 is guided by a winged portion 27 and is held yieldingly to its seat' by a spring 28 which normally forces the valve upwardly. The space in the casing below the supply valve 23 is in communication with the main reservoir through pipe 1.0, so that whenever said valve is opened through the operation or" the diaphragm 1.6, main reservoir air will flow into the vchamber 19 and thence to the brake pipe through opening 29.

lvilhen the engineers brake valve is placed iiieinergency position, brake pipe pressure is exhausted through the brake valve more rapidlythan tie equalizing reservoir pressure is reduced. The result of this is that lthe piessure'in the equalizing reservoir cha-inber 18 oi' the compensating valve will, dui'- ing a certain period, exceed the pressure in `the brake pipe chamber 19 of the compeneating valve and the diaphragm 16 will be depressed during thatperiod of time and thesupplyvalve 23 will be held open. Duri ing -this period the main reservoir air will pass through the compensating' valve to the brake pipe f and then to atmosphere through the engineers brake valve, until the pressure in the equalizing reservoir has been eX- hausted', at which time the supply valve 23 will be closed. f y

Toi-immediately' exhaust the equalizing reservoir pressure upon a sudden reduction ot brake pipe pressure. l provide the equalizing reservoir vvent valve 30. This vent valve consists of a casing 31 secured to the compensating valve easing and provided with an interior bushing 32. The bore ot this bushing is enlarged at its inner end to form the piston chamber 33. Tn this piston chamber is mounted a piston 34 having an outwardly extending stein 35 which carries at its outer end a guide head 36 which is vdesigned to reciprocate in the bore of the bushing 32 near the outer end thereof. Connected to the piston stem is a small slide valve 31, the interior ot the bushing 32 '.torining a seat ior said valve. A. spring 39 normally forces the piston inwardly and 'maintains the valve 37 in position to close an exhaust port 38. The piston 34 is shown asv stopped against a gasket at the inner end oit the Apiston chamber and when in this position leakage around the piston is prevented by an annular rib 40. The equalizing reservoir chamber 18 is connected to the chamber 41betiveen the piston 34 and the guide head 36 by means oic a passage 42, so that equalizing reservoir pressure will be registered within the vent valve casing.

The small chamber 43 is termed at the inner side of the piston 34 and this small chamber is connected to a tank 44 by means oi a passage 45 and a pipe 4G. A small leak port 47 is formed through the piston 34 to permit equaliziiig reservoir pressure to slowly leak into the tank 44. groove 48 is formed in the piston chamber 33 to permit a. free release of the ijn'cssure trapped in tank 44 when the piston 34 is moved inwardly to release position.

tt is manifest that equalizing r ervoii pressure from chamber 18 will pass tarough passage 42 into chamber 41 and then through leak port 47 into the tank 44. It is also manifest that in all slow ieductions oic equaliziiig reservoir pressure tor the purpose of securing slow or service applications of the brakes the trapped pressure in #14 will slowly pass back to chamber 41 through the port 47 and there will be no movement of' the piston 34. and the equalizing reservoir curing an emergency application oit the f2:

brakes, the reduction ot pressure in chamber 18, and consequently in chamber 41, will be more rapid than the reduction oil. pressure iii chamber The trapped pressure in tank 44 will move the piston 34 outwardlj.7 and uncover the equalizing reservoir exhaust port 38, thereby permittingr a complete re lease ot the equalizing reservoir pres-:ure trom chamber 18. This will prevent a downward movement of the diaphragm 1G and the opening ot supply valve 23.

lVhen the piston 34 has been moved inwardly to release position, the release prooi o 48 will be uncovered and the air in tank will have an additional path ot escape around the piston. Then the pressure in tank 44 has been reduced to zero. or approximately so, the spring 39 will move the piston and the slide valve 37 inwardly to close port 38. l

What l claim is:

1. .ik compensating valve ifmnprising u casing, a diaphragm therein and forming an equalizing reserwur chamber and a brake pipe chamber, a supply valve. a reiiaise v lve, both ot said valves being ailaped 'lo be operated by said diaphragijm in response to 'variations of pressure in the equalizingf; reservoir chamber, the supply valve being opened when the equalizing rrfervoir chamY ber pressure exceeds the pr saaie iii thibrake pipe chamber and the release valve by ing opened when the equaliziug reservoir pressure is below the brake pipe pressure. a vent valve vfor the equalizing reservoir Allam A release isieaaoa ber, and means whereby said valvewill re main inactive during all slow changes oi pressure in the equalizing reservoir chamber but will respond to a sudden reduction oi? pressure in the equaliaing;4 reservoir chamber to open said vent valve and exhaust the air from the equalining chamber to atmosphere.

2. A compensating valve comprising a oasing, a diaphragm therein and `forming an equalizing reservoir chamber and a brake pipe chamber, a supply valve, a release valve, both off said valves being adapted to be operated by said diaphragm in response to variait/ions oit pressure in the eipializinp` reserL- voir chamber, the supply valve being open-d when the equalizing reservoir chamber presl sure exceeds the pressure in the brake pipe chamber and the release valve being' opened when the equaliaing reservoir pressure is below the brake pipe pressure, a vent valve for the equalizing reservoir chamber comprising a piston subject on one side to the pressure in the equalizing reservoir chamber `and on the other side to a trapped pressure,

means for slowly equalizing` the pressures on opposite sides ofsaid piston whereby a sudden reduction of pressure in the equalizing reservoir chamber will permit the trapped pressure to move said piston, and an exhaust4 valve adapted to be moved by said piston to y open an exhaust port from the equalizing reservoir chamber upon a sudden reduction ci! pressure in the equalizuma reservoir chamber.

A compensating valve comprising a cas ing', a diaphragm therein and forming,- an equalizingb)` reservoir chamber and a brake pipe chamber, a supply valve, a release valve, both of said valves being adapted to` be operated by said diaphragm in response to variations of pressurein the equalizing reservoir chamber, the supply valve beingopened when the equalizing reservoir chamber nressure exceeds the pressure in the brake pipe chamber and the release Avalve being opened when the equa-lining reservoir pressure is below the brake pipe pressure, a vent valve for the equalininu reservoir chamber comprising' a piston subject on one side to the pressure in the equalizing' reservoir chamber and on the other side t6 a trapped pressure, means? for slowly equalizing the pressures on opposite sides of said piston whereby a sudden reduction of pressure in the equalizing reservoir chamber will permit the trapped pressure to move said piston, an exhaust valve adapted to be moved by said piston 'to open an exhaust port 'from the equalizingI reser voir chamber upon a sudden reduction oil. pressure in the equalizing reservoir chamber, and a spring normally holding;l the piston in position te close the exhaust port from the equalizing reservoir chamber' when the pressures on opposite sides oi? the piston are. equalized.

anni compensating valve comprising a cas*` ing, a diaphragm therein and forming an epializing1 reservoir chamber and a brake pipe chamber, a. supply valve, a release valve, both oif' said valves being` adapted to be operated by said diaphragm in response to variations' oi'f pressure in the equalizingi' reservoir chamber,I the siugiply valve beine opened when the equalizing reservoir chamber pressureexceeds the pressure in the brake pipe chamber and the release valve being` opened when the equalizinp; reservoir pressure is below tbe-brake pipe pressure, a vent valve for the equalifiinr;l reservoir chamber comprising a pistonsubject on one side to the pressure in the equalizing` reservoir chamber and on the other side to a trapped pressure, means for slowly equailizing` the pressures on opposite sides of said piston whereby av sudden reduction et pressure in the equalizing` reservoir chamber will permit the trapped pressure to move said piston, an exhaust valve adapted to be moved by said piston to open an exhaust port from the equalizing reservoir chamber upon a sudden reduction oil` `pressure in the equalizing reservoir chamber, and a release port around the piston arranged -toi be uncoveredivhen the piston is moved to release position to open the exhaust port from the equalizing reservoir chamber.

5. A compensating1 valve comprising a casing, a diaphragm therein and forming an equalizing reservoir chamber and a brake pipe chamber, a supply valve, a release valve, both of saidvalves being adapted to be operated by said diaphragm in response to variations of pressure in the 4eolualizing,` reservoir chamber, the supply valve beine' opened when the equalizing reservoir chamber pressure exceeds the pressure in the brake pipe chamber and the release valve being;` opened when the equalizing reservoir pressure below the brake pipe pressure, a vent valve for the equalizing reservoir chamber comprising a casing, a piston therein dividintgr said casing into two chambers, a leak port formed through the piston and connecting said two chambers, a. passage connecting the chamber at one side of said Vpressures on opposite sides of said piston are equalized, whereby upon slow reductions of the pressure in the equalizing reservoir chamber the piston will remain inactive and the exhaust valve closed, the piston being moved by the trapped pressure when the reduction of pressure in the equalizing reservoir chamber 1s sudden.

6. The combination of a` compensating llO valve to remain inactive during :111 slow reductions of equaiizinn reservoir pressm-e.

8. The combination of n eompensnting vaive adapted to be operated by opposed brake pipe und ei'nnlizinn reservoir pres sures, and a vent valve adapted to operate upon a sudden iedlction in one of said pressures to vent the equalizing reservoir to ntmosphere.

In testimony whereof I hereunto :lix my signa-ture.

SPENCER G. NEA L. 

